摘要:
通过田间试验研究大白菜氮磷钾肥效及其适宜用量.11个田间试验结果表明,土壤基础肥力对大白菜产量的平均贡献率为47.4%;施用氮、磷、钾肥平均分别增产41.26%、14.90%和25.53%,增产效果为NKP.氮磷钾肥的平均产投比分别为13.8、13.2和9.7,氮肥在低肥力土壤的产投比最高,磷钾肥则在高肥力土壤的产投比较高.不同土壤肥力等级和产量水平的三要素推荐施肥量有一定的差异,平均经济施肥量为N 232.0kghm-2、P2O570.5kghm-2和K2O 209.6kghm-2,三要素比例为1:0.3:0.9,预计产量为33308.7kghm-2.
关键词:
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大白菜 /
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土壤 /
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氮磷钾 /
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施肥效应 /
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适宜用量
Abstract:
The responses and optimum application rate of NPK fertilizer for the Chinese cabbage were studied by conducting field experiments.The results showed that the average contribution rate of soil fertility to the Chinese cabbage productivity was 47.4%.The Chinese cabbages that received N,P and K increased their yields by 41.26%,14.90% and 25.53%,respectively,on the average.In other words,the effectiveness on productivity improvement was NKP.The output/input ratios on N,P and K were 13.8,13.2 and 9.7,respectively.N fertilizer had a higher output/input ratio than P or K fertilization when the soil fertility was low.On the other hand,the P and K had higher output/input than N in the soil of high fertility.The recommended application rates of NPK for the Chinese cabbages were found to be N 232.0 kghm-2,P2O570.5 kghm-2 and K2O 209.6 kghm-2,or 1:0.3:0.9 in proportion.The predicted output was 33308.7 kghm-2.
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